Through-silicon via structure
First Claim
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1. An integrated circuit device, comprising:
- a semiconductor substrate having a front surface and a back surface with an integrated circuit (IC) component formed on the front surface;
an interlayer dielectric (ILD) layer formed overlying the front surface of the semiconductor substrate;
a contact plug formed in the ILD layer and electrically connected to the IC component; and
a via structure formed in the ILD layer and extending through the semiconductor substrate, wherein the via structure comprisesa metal layer,a metal seed layer surrounding the metal layer and having a sidewall,a barrier layer surrounding the metal seed layer, anda block layer sandwiched between the metal layer and the metal seed layer and extending along only a portion of the sidewall of the metal seed layer; and
wherein the block layer comprises at least one of magnesium (Mg), iron (Fe), cobalt (Co), nickel (Ni), titanium (Ti), chromium (Cr), tantalum (Ta), tungsten (W), or cadmium (Cd).
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Abstract
A semiconductor substrate has a front surface and a back surface, and a TSV structure is formed to extend through the semiconductor substrate. The TSV structure includes a metal layer, a metal seed layer surrounding the metal layer, a barrier layer surrounding the metal seed layer, and a block layer formed in a portion sandwiched between the metal layer and the metal seed layer. The block layer includes magnesium (Mg), iron (Fe), cobalt (Co), nickel (Ni), titanium (Ti), chromium (Cr), tantalum (Ta), tungsten (W), cadmium (Cd), or combinations thereof.
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Citations
20 Claims
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1. An integrated circuit device, comprising:
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a semiconductor substrate having a front surface and a back surface with an integrated circuit (IC) component formed on the front surface; an interlayer dielectric (ILD) layer formed overlying the front surface of the semiconductor substrate; a contact plug formed in the ILD layer and electrically connected to the IC component; and a via structure formed in the ILD layer and extending through the semiconductor substrate, wherein the via structure comprises a metal layer, a metal seed layer surrounding the metal layer and having a sidewall, a barrier layer surrounding the metal seed layer, and a block layer sandwiched between the metal layer and the metal seed layer and extending along only a portion of the sidewall of the metal seed layer; and wherein the block layer comprises at least one of magnesium (Mg), iron (Fe), cobalt (Co), nickel (Ni), titanium (Ti), chromium (Cr), tantalum (Ta), tungsten (W), or cadmium (Cd). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device, comprising:
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a semiconductor substrate having a front surface and a back surface with an integrated circuit (IC) component formed on the front surface; an interlayer dielectric (ILD) layer formed overlying the front surface of the semiconductor substrate; a contact plug formed in the ILD layer and electrically connected to the IC component; and a via structure formed in the ILD layer and extending through the semiconductor substrate; wherein the via structure comprises a copper layer, a copper seed layer surrounding the copper layer and having a sidewall, a barrier layer surrounding the copper seed layer, and a manganese (Mn) layer sandwiched between the copper layer and the copper seed layer and extending along only a portion of the sidewall of the copper seed layer; and wherein the via structure comprises an end that is exposed on the back surface of the semiconductor substrate. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An integrated circuit (IC) device, comprising:
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a substrate having an opening defined therein, a front surface, a back surface, and an IC component formed on the front surface, the opening extending from the front surface of the substrate to the back surface; an interconnection structure over the front surface of the substrate and electrically coupled to the IC component; and a via structure in the opening, extending through the substrate, and electrically coupled to the interconnection structure, the via structure comprising; a metal layer; a metal seed layer surrounding the metal layer and having a sidewall; a barrier layer surrounding the metal seed layer; and a block layer sandwiched between the metal layer and the metal seed layer and extending along only a portion of the sidewall of the metal seed layer, the block layer comprises a material including manganese (Mn), magnesium (Mg), iron (Fe), cobalt (Co), nickel (Ni), titanium (Ti), chromium (Cr), tantalum (Ta), tungsten (W), or cadmium (Cd). - View Dependent Claims (16, 17, 18, 19, 20)
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Specification